Electrical measuring instrument.



S. M. KlNTNER.

ELECTRICAL MEASURING INSTRUMENT.

APPLICATION FILED MAR. 17, 1905.

Patented May 31, 1910,

3 SHEETS-SHEET 1.

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AT'TORNEY 'vk INVE TOR Wmv WITNESSES S. M. KINTNER.

ELEGTRIGAL MEASURING INSTRUMENT.

APPLIGATION FILED MAR. 17, 1905.

Patented May 31, 1910.

3 SHEETS-SHEET 2.

Z INVENTOR 5 WITNESSES: @Zfim ATT'ORNEY S. M. KINTNER.

BLEGTRIGAL MEASURING INSTRUMENT. APPLICATION FILED MAR. 17, 1905.

959,551 Patented May 31,1910.

3 SHEETS-SHEET 3.

III 31 fi- I WITNESSES:

INVENTOR ATONY SAMUEL M. KINTNER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC 8: MANUFACTURING GOIYIPANY, A. CORPORATION OF PENNSYLVANIA.

ELECTRICAL MEASURING INSTRUMENT.

Specification of Letters Patent.

Patented May 31, 1910.

Application filed March 17, 1905. Serial No. 250,642.

. State of Pennsylvania, have invented a new and useful Improvement in Electrical Measuring Instruments, of which the following is a specification.

My invention relates to electrical measuring mstrpments, and it has for its object to provide means for improving the operation and for simplifying the construction of such instruments.

A further object is to provide unimproved form of electrostatic instrument which shall be especially well adapted to the measurement of high voltages.

My invention is illustrated in the accompanying drawings, in which- Figure l is a transverse, sectional view of an instrument constructed in accordance therewith. Fig. 2 is a view, partially in side elevation and partially in section, of the instrument shown'in Fig. 1. Fig. 3 is a top plan view of theinstrument shown in Fig. 1. Fig. 4 is a plan view of certain of the parts of the instrument embodying my invention. Fig. 5 is a view, in perspective, of one of the parts shown in Fig. 4- Fig. 6 is a view, partially in section and partially in side elevation, of a slightly modified structure and Fig. 7 is a plan view of certain of the parts of the instrument shown in Fig. 6.

An insulating slab 1 is provided with apertures, in which tubular insulators 2 and 3 are secured. Conducting rods 4 and 5 that are provided respectively with binding posts 6 and 7 at their upper ends and cylindrically curved conducting plates 8 and S) at their lower ends, project through and are ported by the insulators 2 and 3. Suspended bet-ween the plates 8 and 9, is a body 10, preferably of conducting material, that comprises two elongated shells 30 and 31 having vertical axes and connected together by a vane 32. A suspension fiber 14 is attached, at its lower end, to an insulating rod 15, one end of which is secured to the vane 32 of the body 10. The upper end of the fiberis wound about one end of a rod 16, that has bearings in a suitable post 17, the other end of the rod being provided with a milled head 18 that is convenienth located supand by means of which the body 10 may be adjusted vertically. The suspension fiber let is surrounded by a tube 19 that is connected, at its lower end, to the insulating rod 15 and that carries, at its upper end, a pointer 20 which moves over a dial 21 located on the upper side of the insulating slab 1. A collar 22 is rigidly secured to the tube 19 and 'one end of a coil-spring 23 is attached thereto, the other end of the spring being attached to a bushing 24 that fits in an aperture in the slab l and is provided with-a milled head 25. The angular position of the body 10, with respect to the plates 8 and 9, and the tension of the spring 23 may be adjusted by means of the milled head 25. After adjustmenthas been effected, rotation or other movement of the tubular piece 24 may be prevented by means of a set-screw 26. The insulating slab l is supported upon a metallic receptacle 28 that contains an insulating fluid 29, preferably of higher specific inductive capacity than air which may be confined under pressure, if desired, and in which the plates 8 and 9 and the suspended, elongated body 10 are immersed, and, if desired, the receptacle 28 may be connected to ground, as indicated in Fig. 1. If the fluid is to be maintained under pressure, suitable means, such as a pump will be provided, whereby compression may be efiected.

The employment of curved terminal plates 8 and 9 of approximately cylindrical contour, and arranged symmetrically with respect to the suspended body, substantially as indicated in and 5, permits of the use of a uniform scale 21, since the forces which tend to cause rotation of the suspended body will vary approximately in proportion to the difierences of potential that exist between the terminal plates.

While, as has been stated, the suspended member is composed preferably of conducting material and may then be made in the form of a shell that may be almost entirely or wholly supported by the insulating fluid, it may, if desired, be composed of any suitable insulating material, such as glass or porcelain that has a higher specific inductive capacity than that of the immersing fluid. In the use of insulating material, it will be found desirable and perhaps necessary to make the suspended body solid in order to ber rotatably suspended between the said faces, of an insulating fluid in which the said parts are immersed, anda grounded metallic receptacle for the insulating fluid.

3. The combination with plate circuit terminals having concave opposing faces, andja vertically elongated member movably supported between the terminals, of a compressed insulating fluid in which said parts are immersed, and a grounded receptacle for the insulating fluid.

4. An electrical measuring instrument comprising vertically elongated and relatively movable members, a body of compressed fluid in which they are immersed, and a metallic receptacle for the fluid.

5. An electrical measuring instrument comprising vertically elongated and relatively movable members, a body of compressed fluid in which they are immersed, and a grounded receptacle for the fluid. v

6. In an electrostatic measuring instrument, the combination withcircuit terminals,

' a member rotatably supported between the terminals and comprising two elongated bodies having vertical axes, and a connecting vane for the bodies. 7

7. In an electrostatic measuring instrument, the combination with curved plate circuit terminals, and a member movably supported between the terminals and comprising a vane, and elongated bodies attached thereto with their longer axes vertical, of a compressed insulating fluid in which said parts are immersed.

8. In an electrostatic measuring instrument, the combination with curved plate circuit terminals, and a member movably supported between the terminals and comprising a vane, and elongated bodies attached thereto with their longer axes vertical, of an insulating fluid in which said parts are immersed, and a metallic receptacle for the fluid.

9. In an electrostatic measuring instrument, the combination with curved plate circuit terminals, and a member movably supported between the terminals and comprising a vane, and elongated bodies attached thereto with their longer axes vertical, of an insulating fluid in which said parts are imilnersed, and a grounded receptacle for the Y 10. The combination with a vertically elongated rotatable member, of two cylindrically-curved stationary plates located adjacent thereto and so arranged that the distances between the concave faces thereof and the movable member vary inversely with the movement of the movable member.

11. The combination with a vertically elongated rotatable member, of two curved plates located ad'acent thereto and so arranged that the distances between the concave faces thereof and the movable member vary inversely with the movement of the movable member, and an insulating fluid in which said parts are immersed.

12. The combination with a vertically elongated rotatable member, of .two cylindrically curved stationary plates located adjacent thereto and so arranged that the distances between the concave faces thereof and the movable member vary inversely with the movement of the movable member, and a compressed insulating fluid in whichsaid parts are immersed.

13. The combination with a vertically elongated rotatable member, of two cylindrically curved stationary plates located adjacent thereto and so arranged that the distances between the concave faces thereof and the movable member vary inversely with the movement of the movable member, an insulating fluid in which said parts are immersed anda grounded receptacle therefor.

14. The combination with a vertically elongated rotatable member, of two cylindrically curved stationary plates located adjacent thereto and so arranged that the dis tances between the concave faces thereof and the movable member vary inversely with the movement of the movable member, a. compressed insulating fluid in which said parts are immersed and a grounded metallic reccptacle therefor.

15. The combination with a rotatable member comprising substantially cylindrical bodies the axes of which are arranged parallel to the axis of rotation of the member, of cylindrically curved stationary vanes the concave faces of which are arranged adjacent to the cylindrical bodies and so that the distances between them and the bodies vary inversely with the movement of the movable member.

16. The combination with cylindrically curved stationary vanes, of a member rotatably supported between the concave faces thereof and comprising substantially cylindrical, elongated bodies the longer axes of which are parallel to the axis of rotation of the member.

17. The combination with cylindrically curved stationary vanes, of a member rotatably supported between the concave faces thereof and comprising substantially cylindrical, elongated bodies the longer axes of which are parallel to the axis of rotation of the member, and an insulating fluid in which said parts are immersed.

18. The combination with cylindrically curved stationary vanes, a member rotatably supported between the concave faces thereof and comprising substantially cylindrical,

elongated bodies the longer axes of which are parallel to the axis of rotation of the member, and a compressed insulating fluid in which said parts are immersed.

5 19. The combination withcylindirically curved stationary vanes, of amember rotatably sup orted between the concave faces thereof an comprising substantially cylindrical, elongated bodies the longer axes of 10 which are parallel to the axis of rotation of the member, an insulating fluid in which said parts are immersed, and a grounded receptacle for the fluid.

In testimony whereof, I have hereunto subscribed my name this l5thday of March, 15

SAMUEL M. KINTNER. Witnesses:

HENRY H. GAIJJEBIEB. BIRNEYV Hmns. 

